Granada High's Maxime Rooney broke meet records in the boys 200- and 500-yard freestyle and helped set a new standard in the 400 freestyle relay as the North Coast Section swimming championships got underway with preliminaries from Concord Community Pool on Friday.

Rooney's first record came in the 200 freestyle, which he finished in 1:35.69. Then he shattered the old mark in the 500 freestyle by more than three seconds, touching the wall in 4:20.60. His closest finisher was more than seven seconds behind.

Both records previously belonged to Las Lomas' Jackson Miller, who set them at last year's meet. Rooney, a sophomore, could lower those records again during Saturday's finals, which begin at 10:30 a.m..

At the end of the meet, Rooney and his Granada teammates Bryce McLaggan, Trent Trump and Nick Silverthorn set a new NCS record of 3:00.13 in the 400 freestyle relay, bettering the previous record time of 3:01.70 set last year by Campolindo. The Granada teammates also earned the top seed for the 200 medley relay final.

Silverthorn and Trump also qualified for the 200 freestyle final in a strong start to the meet for Granada, one of the teams capable of dethroning nine-time defending boys team champion Campolindo.

Silverthorn was the top qualifier in the 100 breaststroke, as well.

Also shining for Granada was sophomore Moriah Simonds, who posted the fastest qualifying time in the girls 200 freestyle (1:47.93) and 500 freestyle (4:47.50).

A couple small-school swimmers also made their mark. College Prep's Arjun Sharma and Grant Watson were the top two qualifiers in the boys 100 butterfly, and Athenian freshmen Emma Cottrill went the fastest in the girls 50 freestyle.

Other local top qualifiers included San Ramon Valley's girls 200 medley relay team, Amador Valley's Kevin McLaughlin (boys 200 individual medley), Acalanes' Brittany Usinger (girls 100 butterfly), Carondelet's Maddie Murphy (girls 100 freestyle), Carondelet's 200 freestyle relay team, Castro Valley's boys 200 freestyle relay team, Carondelet's Samantha Coloma (girls 100 backstroke) and San Ramon Valley's Heidi Poppe (girls 100 breaststroke).

In the girls 400 freestyle relay, Carondelet had the top time at 3:27.44. Carondelet holds the national record in the event at 3:20.42, set last year.